MS2A40LWS
MSKSEMI
Needs validationlow risk
An upgrade with higher voltage and current ratings and lower forward voltage for better efficiency.
Best Alternatives to RB550V-30
RB550V-30 is a 30V, 1A Schottky diode in a SOD-323 package. Several pin-compatible alternatives with higher voltage ratings like B1040WS and MS2A40LWS are available, offering similar or improved performance.
AI replacement insight
Electrical risklow
Most candidates have higher voltage ratings. Check Vf for efficiency impact.
Package risklow
All recommended candidates use the same SOD-323 package.
Can it be replaced directly?
Yes, B1040WS is a direct pin-compatible replacement with a higher voltage rating.
Best replacement path
Upgrade to MS2A40LWS for improved electrical specs or use B1040WS for a close parametric match.
Main risk
The primary risk is a mismatch in forward voltage (Vf), which can affect power efficiency and thermal management.
Recommended alternatives
5Alternative comparison matrix
| Feature / factor | RB550V-30 | MS2A40LWS | B1040WS | PSBD3D40V1H | Compatibility / risk |
|---|---|---|---|---|---|
| Package | SOD-323 | SOD-323 | SOD-323 | SOD-323 | SOD-323 — Same package and pin count.; B1040WS: Same package and pin count.; PSBD3D40V1H: Same package and pin count.; 1N5819WS(SL): Same package and pin count. |
| Voltage | 30V | 40V | 40V | 40V | 40V — Higher voltage rating provides more margin.; B1040WS: Higher voltage rating provides more margin.; PSBD3D40V1H: Higher voltage rating provides more margin.; 1N5819WS(SL): Higher voltage rating provides more margin. |
| Current | 1A | 2A | 1A | 1A | 2A / 1A — Higher current rating provides more margin.; B1040WS: Current rating is identical.; PSBD3D40V1H: Current rating is identical.; 1N5819WS(SL): Current rating is identical. |
| Forward Voltage | 0.52V @ 1A | 0.42V @ 1A | ~0.58V @ 1A | 0.55V @ 1A | 0.42V @ 1A / ~0.58V @ 1A / 0.55V @ 1A / 0.6V @ 1A — Lower Vf improves efficiency.; B1040WS: Slightly higher Vf, performance is comparable.; PSBD3D40V1H: Slightly higher Vf, performance is comparable.; 1N5819WS(SL): Higher Vf increases power loss. |
Application & sourcing insights
Questions & answers
MS2A40LWS is an excellent upgrade with higher voltage (40V) and current (2A) ratings and lower forward voltage. For a closer match, B1040WS is a strong pin-compatible option.